code: def nybb_polydf(nybb_filename):
      nybb_polydf = read_file(nybb_filename)
      nybb_polydf = nybb_polydf[["geometry", "BoroName", "BoroCode"]]
      nybb_polydf = nybb_polydf.rename(columns={"geometry": "myshapes"})
      nybb_polydf = nybb_polydf.set_geometry("myshapes")
      nybb_polydf["manhattan_bronx"] = 5
      nybb_polydf.loc[3:4, "manhattan_bronx"] = 6
      nybb_polydf["BoroCode"] = nybb_polydf["BoroCode"].astype("int64")
      return nybb_polydf
  
imports: import warnings
  import numpy
  import pandas
  import geopandas
  from geopandas import GeoDataFrame, read_file
  from pandas.testing import assert_frame_equal
  import pytest
  from geopandas._compat import PANDAS_GE_15, PANDAS_GE_20
  from geopandas.testing import assert_geodataframe_equal, geom_almost_equals
label_desc: Use image node_id 1 for calling a global function with example usage: nybb_polydf(nybb_filename) and returns: nybb_polydf